Jambs d



(No Model.)

J. D.,PIERGE. Stove Grate.

No."242,691. Pat e nte djune 7,1881.

UNITED STATES PATENT OFFICE.

JAMES D. PIERCE, OIj MILWAUKEE, WlSGONSIN, ASSIGNOR TO BUTCHER & VOSE,OF SAME PLACE.

STOVE-G RATE.

SPECIFICATION forming part of Letters Patent No. 242,691, dated June 7,1881.

Application filed March 15, 1581. (No model.)

To all whom it may concern Be it known that I, JAMES D. PIERCE, acitizen of the United States, residing at Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented new and usefulImprovements in Stove-Grates, of which the following is a specification.

I have improved the grate in which concentric rings are adapted to beoscillated independently upon a center pin, or altogether upon thegrate-support. My object is to provide means by which the independentrings are maintained in proper relation and avoid binding upon thecenter pin, the function of which is merely to hold the rings togetherupon the grate-support. The several rings are arranged in the samehorizontal plane, and they are provided with circular collar-bearin gsadapted to intermatch with each other, the outer ring being supported bysuch a collar within a recess in the grate-supporting bar. Thisconstruction gives the advantage of a center bearing for each ringindependent of the confining-pin, and it is this arrangement of centercollar-bearings, in connection with a grate-support depressed betweenits journals,

that allows the rings to be supported with their upper surfaces in thesame horizontal plane.

Referring to the accompanying drawings, Figure 1 represents a top viewof my improved grate; Fig. 2, a vertical cross-section of the same, andFig. 3 the several rings and the support separated and in section toshow more particularly the collar-bearings of each.

The outer ring or bar, A, is formed with a central part, a, connectedbytwo or more arms, I) b, giving the form of a skeleton-dish, and uponwhich the central and intermediate rings are supported in concentricrelation. The intermediate ring, 0, has a central part, d, connected byslightly-dished arms a, and the center ring, f, has a hole, 9,corresponding with holes g" g in the central parts of the outer andintermediate rings for the pin h, by which they are loosely secured uponthe support and in such manner that the center and intermediate ringsare free to be turned independently or all together by the outer ring,to clear the grate at the middle or at the circumference, and alike atevery part. The intermediate ring is supported so as to be turned freeof the arms of the outer ring, and the central ring is supported free ofthe arms of the intermediate ring, while the outer ring is supportedfree of contact with the journal ends of the support for the grate. Thesupport j is adapted for being turned upon journals kk, and for thispurpose has the usual dumping-arm, I. It is formed with a recess, m, anda circular shoulder, m, to receivea corresponding collar-bearing, n, onthe under side of the center part, a, of the outer ring, while the upperside of said central part, a, has a recess and circular shoulder, a, toreceive a corresponding collar-bearing, r, on the under side of thecenter part, d, of the intermediate ring.

The central rin g has an under circular collav-bearing, f, fitting intoa corresponding shouldered recess, 0, on the upper side of saidintermediate ring. This construction gives to each ring a separatecollar-bearing around the The edges of the rings are formed withprojections s, to aid in clearing the spaces and cutting out clinkers,while openings 2; are formed in the rings to give the proper draft andaid in freeing the grate of ashes.

The rings are provided with eyes 20, by which they are oscillated.

The grate-supportj is depressed between its journals 7c is, and thecollar-bearin g parts of the rings are set one within the other, tobring the riu gs in the same horizontal plane and the outer ring clearof the journals of the grate-support.

I do not claim, broadly, a grate of independent concentric rings adaptedto be oscillated separately or all together and provided with radialprojections in the spaces between the rings; but in such a grate myimprovements embrace matters of construction and combination whichrender the grate more desirable and better adapted for the freeoperation of the independent grate-forming rings.

I claim- 1. The independent concentric rings A of and their support,eachformed with interm atch ing collar-bearings concentric with andindependent of the grate-confining pin, substantially as described, forthe purpose specified.

2. The combination of the grate-supporting bar having a circularshouldered recess, m,with a series of independent concentric rings, theouter one, A, having an under bearing-collar, a, corresponding with saidrecess, and the intermediate one, 0, having an under collar-bearing, r,and an upper circular shouldered recess, 0, interrnatching withcorresponding parts of the center ring, f, and of the said outer rings,substantially as described, for the purpose specified.

3. The grate-support depressed between its journals and hayin g acircular shouldered recess, and the center bearing parts of the outerand the intermediate rings formed relatively below the plane of saidrings, whereby to bring the intermediate rings on the same horizontalplane with the outer ring and the latter free of contact with thejournals of the grate-support, substantially as described.

4. The grate herein described, consisting of the independent concentricrings formed with intermatching collar-bearings, the grate journaledsupport having a shouldered recess for the collar-bearing of the outerring and a confining-pin independent of said collar-bearings, the saidrings being formed with edge projections and supported by saidinterrnatchin g collar-bearings, with their upper surfaces in the sameplane, substantially as described, for the purpose specified.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing. witnesses.

JAMES D. PIERCE.

Witnesses:

PETER KREMERS, CHARLES N EUBAUER.

